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Antidepressants and anti-psychotic medications can disrupt your cycle and cause you to skip periods or get them more frequently. âMany of these medications elevate a pituitary hormone called prolactin, which can alter other hormones in your body that regulate your cycle,â Minkin says.
In those species that exhibit free-running rhythms in constant light, the period of the rhythm is affected by the intensity of the light (Aschoff's rule). Some drugs, such as methamphetamine and deuterium oxide, can also affect circadian period.